No info as yet
Im afraid I have no experiences from others as of yet. However I have done a bit of reading and the ceiling insulation looks good.
A builder I spoke to said that the use of rockwool in pitched ceiling spaces was bad idea as it tends to slip and compress after a few years and is prone to dampness.
For a 16x12 conservatory, the estimated costs for doing the ceiling only is probably in and around the 2k mark. My problem is compounded by the fact that the genius who originally built the sun room put no insulation on the dwarf walls or walls between windows so I may need to get that done was well. Its about 30% of the wall surface (70% windows). Between removing the existing ceiling and insulation, re-insulating and skimming and replacing the current internal plaster boarded walls with skimmed insulated boards, I'm looking at a cost of 4k. A lot to end up with the same room, only a few degrees warmer.
D